Britney Spears sings every song during her Piece of Me show LIVE, her sound engineer, Robert "Cubby" Colby, insists in a recent interview.

"Britney sings every song live, but there are additional tracks when they're doing the heavy dance numbers," says Colby. "Snapshots give Marc Delcore [the show's musical director and keyboard player] the security of knowing that these levels that they work on so hard translate to the live environment."

Oh ok.

"Britney pretty much has to stick to her script, but I have a lot of freedom to play different chords or different sounds," said Marc Delcore, the show's musical director and keyboard player. "Anything that the band throws at him, Cubby hears right away and he makes the adjustment. He catches everything and is able to make those adjustments with the console. It's important for him to be able to make those changes on the fly. He's such a great engineer."